1510 kHz Spectrum Monitoring

carried out by Günter Lorenz (mailto:glorenz@lorenzsoft.de). All times UTC.

Equipment: EKD500, Grahn magnetic loop, Spectrum Lab software

Location: Freising, Germany

Propagation conditions: solar storm and the days after, “normal” conditions from 19.11.2004

Unfortunately, the images in the first part are not continuous, because I made a mistake setting the scroll interval.

http://www.myradiobase.de/mediumwave/capt1510_49.jpg 08.11.2004

Here we can see how signals fade in. The image ends at 08.11.2004 24:00.

http://www.myradiobase.de/mediumwave/capt1510_50.jpg 09.11.2004

We can see 2 “broad” carriers, most likely WLAC and WWZN. The image ends at 09.11.2004 04:00.

http://www.myradiobase.de/mediumwave/capt1510_51.jpg 09.11.2004

We can still see 2 “broad” carriers, most likely WLAC and WWZN. Everything fades out rapidly at 06:00. The image ends at 09.11.2004 08:00.

http://www.myradiobase.de/mediumwave/capt1510_52.jpg 09.11.2004

We start at 23:00 where few carriers fade in. The image ends at 09.11.2004 24:00.

http://www.myradiobase.de/mediumwave/capt1510_53.jpg 10.11.2004

Now, this gets interesting. What faded in, disappears for more than 90 minutes. From 01:30, there are some stable carriers, and only around 03:00, presumably WLAC and WWZN return, but weaker and even broader then the day before. The image ends at 10.11.2004 04:00.

http://www.myradiobase.de/mediumwave/capt1510_54.jpg 10.11.2004

More blackouts to see here, with presumed WWZN disappearing just after 04:00, and presumed WLAC quickly fading out before 06:00. The image ends at 10.11.2004 08:00.

Back to normal…

http://www.myradiobase.de/mediumwave/capt1510_63.jpg 19./20.11.2004

A normal fade in just after 23:00, with WWZN on .018 getting strong enough to produce audio (red color). At least 2 s/off at 01:00. Note the very typical zigzag on .013.

http://www.myradiobase.de/mediumwave/capt1510_64.jpg 20.11.2004

A strong WWZN all through the night.

http://www.myradiobase.de/mediumwave/capt1510_65.jpg 20.11.2004

Fading out quickly at 06:00, but still visible carrier for some 45 minutes.

(to be continued)

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